Index Time: It hasn't been indexed yet. The amount of time before the engine indexes your site should be listed on the search engine's submission page, but these aren't always accurate or may be out of date. On the average, index times range from one to eight weeks depending on the engine. Some engines like AltaVista and Inktomi provide paid options if you wish to be indexed more quickly.

TIP! Time frame and expectations: Allow up to 4 months, if you are number 10 and want to be number 1, then it may just be time that is needed - but if you aren't showing up at all, then you need to look at keywords, content, title, description and keyword tags.

Already Indexed: The major engines won't tell you if you're listed; it's up to you to find out. The method to discover if a page or domain has been indexed varies from one engine to another. Don't assume you're not indexed just because you searched through keywords and you didn't come up in the first few pages of results. You could still be indexed and end up at the bottom of the heap.

Roadmap from Home Page: Some engines have been known to drop pages that cannot be traveled to from the home page. HotBot has been rumored to do this. Think of your site links as a series of roads from one page to another. If there's no road from your home page to the page you want indexed, a search engine may decide the page is unnecessary.

External Links: Some search engines like Google and HotBot have been known to refuse to index Web sites that don't link to any other sites. Or, they may index your home page but refuse to index any other pages unless there are links from another domain. Or, they may index you for a while but then "prune" their database later because you didn't achieve any external links after a certain period of time.

Frames: Content inside of HTML frames can cause problems with submissions because the search engine may index the main content of the page, but not the surrounding menu frame. Visitors to your site find some information but miss the associated menu. It's generally better to create non-framed versions of your pages.

Spider Blocks: Search engine spiders cannot index sites that require a registration or password, and they can't fill out forms. This also applies to indexing of content from a searchable database. The solution is to create static pages that the engines can find and index without performing a special action on your site. Depending on your database system, there are both utility programs and companies that can assist you with this.
 

Free Sites: Because of all the "junk" submissions from free web sites like Geocities, many engines choose not to index sites from such domains or limit the number of pages they accept.

Guilt Through Association: If your Web site shares the same IP address as other Web sites on your host's Web server, you may find your IP quietly banned because of something someone else did. Ask your hosting service if your domain name has its own unique IP assigned to it. If not, ask them to move it to its own IP to avoid being penalized because of someone else.